Fix parameter editor navigation: preserve character context when returning to L2D manager (#212)

This commit fixes the issue where clicking the back button in the parameter editor would redirect to the character management page instead of returning to the correct character's L2D manager page.

Changes:
1. l2d_manager.html: Dynamically update parameter editor link to pass lanlan_name parameter
2. live2d_parameter_editor.html: Fix return logic to correctly get and pass lanlan_name parameter
3. chara_manager.html: Fix API path from /api/voices to /api/characters/voices and add data.voices existence check

Co-authored-by: Hongzhi Wen <wenguanjung@aliyun.com>

Author: Tonnodoubt

templates/chara_manager.html

@@ -1261,7 +1261,7 @@ <h2 style="margin: 0;" data-i18n="character.manager">角色管理</h2>
                     const response = await fetch('/api/characters/voices');
                     const data = await response.json();
                     const select = form.querySelector('select[name="voice_id"]');
-                    if (select) {
+                    if (select && data && data.voices) {
                         // 清空现有选项并使用 DOM API 创建
                         while (select.firstChild) select.removeChild(select.firstChild);
                         const voiceNotSetText = window.t ? window.t('character.voiceNotSet') : '未指定音色';

templates/l2d_manager.html

@@ -541,6 +541,22 @@
                 return lanlanName;
             }
 
+            // 动态设置参数编辑器链接，传递 lanlan_name 参数
+            (async function updateParameterEditorLink() {
+                try {
+                    const paramEditorLink = document.querySelector('a[href="/live2d_parameter_editor"]');
+                    if (paramEditorLink) {
+                        const lanlanName = await getLanlanName();
+                        if (lanlanName) {
+                            paramEditorLink.href = `/live2d_parameter_editor?lanlan_name=${encodeURIComponent(lanlanName)}`;
+                            console.log('参数编辑器链接已更新，角色:', lanlanName);
+                        }
+                    }
+                } catch (error) {
+                    console.error('更新参数编辑器链接失败:', error);
+                }
+            })();
+
             // 保存模型设置到角色的函数
             async function saveModelToCharacter(modelName, itemId = null) {
                 try {